CN1134485A - Press section of paper machine which press section is provided with two separate press nips - Google Patents

Press section of paper machine which press section is provided with two separate press nips Download PDF

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Publication number
CN1134485A
CN1134485A CN95107629A CN95107629A CN1134485A CN 1134485 A CN1134485 A CN 1134485A CN 95107629 A CN95107629 A CN 95107629A CN 95107629 A CN95107629 A CN 95107629A CN 1134485 A CN1134485 A CN 1134485A
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China
Prior art keywords
nip
last
press
press section
fabric
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Granted
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CN95107629A
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Chinese (zh)
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CN1041006C (en
Inventor
朱海·柯维马
朱海尼·帕佐拉
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Valmet Technologies Oy
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Valmet Paper Machinery Inc
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Publication of CN1134485A publication Critical patent/CN1134485A/en
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Publication of CN1041006C publication Critical patent/CN1041006C/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/08—Pressure rolls

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  • Paper (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Advancing Webs (AREA)

Abstract

A press section for a paper machine employing at least two press nips placed one after the other. Of these nips, at least the first nip is an extended nip or an extended roll nip. The last nip in the press section is placed on a level higher than the preceding nip. The first nip and/or, when more than two nips are employed, the nip that immediately precedes the last nip is/are provided with two press fabrics that receive water. The paper web is transferred on the lower fabric of the two press fabrics onto an upper fabric of the last nip. On the lower face of the upper fabric, the web is transferred into the last nip. After the web transfer point, the upper fabric of the last nip has a relatively short upwardly inclined run. After this, the upper fabric is turned and guided by the lower roll of the last nip over a considerable sector thereof. The last nip is placed after, or at the vicinity of, the uppermost point of the lower roll that forms the last nip. The point of transfer of the web onto the drying wire of the first group in the dryer section following after the press section is placed underneath the level of the last nip.

Description

The press sections with two separation nips of paper machine
The present invention relates to the press section of paper machine, this press section comprises the nip of placing before and after two at least, and in these two nips, first nip is the nip that adds long nip press or pressure roller enlarged diameter or do as usual at least; In this press section, the position of a back nip is higher than the position of previous nip; In this press section, if use plural nip, then in the end nip nip before has two suction press fabrics, paper web is sent on the top fabric of last nip after being sent on the bottom fabric of described press fabric, and this paper web is admitted to last nip on the lower surface of this top fabric.
No matter one of most important quality requirement of any kind paper or cardboard is in that structure all gets evenly on the macroscopic view or on microcosmic.The structure of paper, particularly printing paper must be well-balanced.The desired good print of printing paper means that the two sides of paper all gets smooth, smooth and has certain water imbibition.The well-balanced property of the characteristic of paper, particularly density is subjected to the influence of paper machine press section operation quality to a great extent, and this operation also has significant impact to the uniformity of the profile of paper on horizontal and paper machine direction.
The raising day by day of paper machine running speed has brought new problem to be solved, and these problems are relevant with the behavior in service of paper machine mostly.Current running speed is up to 1500 meters of about per minutes.Under such high speed, the what is called sealing press section that is combined compactly by the some pressure rollers that are contained in around the shiny surface breast roll all turns round satisfactoryly usually.Can enumerate Sym-Press II of the applicant as the example of this class press section TMAnd Sym-PressO TMThe type press section.
From energy-conservation viewpoint, with press dewatering be better than with the evaporation dewater.Therefore people make all effort and adopt milling process to make paper web slough the water of maximum, so that the least possible with the dehydrating amount of evaporation.But, the raising of paper machine running speed is given with the milling process dehydration and has been brought new problem, because can't fully improve the squeeze force of pressure roller, especially because the time by nip falls short of by a narrow margin at a high speed, and, on the other hand, the pressure peak of squeezing can't surpass a certain limiting value and destruction structure by a narrow margin.
Raising along with the paper machine running speed; the runnability problems of paper machine also surfaces; because high-moisture and the low intensive too high sudden surge that is unable to undergo compression stress by a narrow margin or at a high speed and the dynamic force that change caused of direction, paper web takes place to rupture or other operating trouble takes place and causes shutdown as a result.
Another shortcoming of press section is usually that the vacuum furnace of use in described press section need vacuumize energy consumption and vacuum furnace can produce noise now.And vacuum furnace and band perforate roller shell thereof, inner vacuum tank and other vacuum plant all are to need the often expensive components of maintenance.
About the prior art relevant with the present invention, can be referring to the applicant's Finnish patent application 905798 (being european patent application 0487483A1), narrated a kind of method in this patent, the combination that comprises the following steps: paper web is sent on the dry net of drying section from forming net under the support of water absorbing fabric, transmission fabric or any respective fabric face that other is advanced along closed loop all the time; Transfer rate preferably is higher than about 25-30 meter per seconds; With at least two nips in succession paper web is dewatered, in these two nips, at least one nip is the so-called long nip press that adds, its length z＞about 100mm on the paper machine direction, the described long nip press that adds cooperates a flexible expelling belt closed loop that flows to form, add distribution on the long nip press laterally still on the paper machine direction, all will the regulating and/or select of paper web, so that set or control the different qualities pattern of paper web no matter the compression pressure district is described.
A further essential characteristic of the apparatus and method of described Finnish patent application 905798 is, paper web is not by this press section on a press fabric, but arrange fabric like this in order to ensure fully dewatering, paper web passes from paper injection point beginning fabric on first and is preferably first nip that adds long nip press, pass behind the described nip paper web and pass on first time fabric and first time fabric also passes this nip, then paper web passes on second on the fabric from described first time fabric, fabric carries paper web and enters second nip on second, this second nip is common nip or is preferably and adds long nip press, then fabric is transferred on second time fabric of advancing along a closed loop, this second time fabric also passes described second nip, its upper surface the paper web carrier band to dry net or carrier band go into next nip.
The objective of the invention is further to improve prior art, thus the shortcoming of roughly eliminating above-mentioned most of shortcoming and hereinafter will saying.
An object of the present invention is to provide a kind of structure, it is very compact, and is particularly very compact on the paper machine direction.This purpose particular importance that in the update of paper machine, seems because this moment must be high dehydration property, the press section that uses one or more new press sections that add long nip press to put into the some common nips of former cause to constitute (the applicant's SYM-PRESS II for example TM) in the position occupied.
Another object of the present invention provides a kind of like this press section, wherein, can use higher squeeze pressure in first nip, thereby help to improve the dehydration property of this press section, thereby be attained at the sufficiently high paper web of solids content.This back one factor is very important, because the raising of solids content has also just improved the intensity of paper web, thereby guarantees safe reliable and unlikely interruption of transmission by the paper web of this press section behind first nip.
Of the present invention another is not to be that indispensable purpose provides a kind of press section that uses steam chest, infrared heater to heat paper web and make it further to dewater.
About with the close relevant prior art of the present invention, can be further referring to applying date of the applicant be the not FI patent application 935501 (being UK Patent Application 94119255.1) of bulletin as yet on December 8th, 1993.In described patent application, narrated a kind of press section, wherein, following feature can be described as novel: first nip of this press section is the squeezing of nip lengthening, two relative suction press fabrics pass this nip, thereby in the squeezing of first nip lengthening, all dewater on both direction in the two sides of paper web; Last press felt in the squeezing of described nip lengthening is the paper injection fabric, it is downloaded to paper web on its lower surface from forming net, in this press section, cooperate with a shiny surface breast roll, at least form two pressure roller nips, the position of this breast roll is adorned to such an extent that the cardinal principle specific pressure head of district squeezes height; In two pressure roller nips, the press fabric in the first pressure roller nip is made of described paper injection fabric, and the second pressure roller nip has the suction press fabric of himself; And after the squeezing of described first nip lengthening, the orientation of paper web turns to angle a, and this angle Selection is a 〉=about 45 °.
In brief, the objective of the invention is further to improve above-mentioned prior art, a kind of compactness, simple paper machine press section are provided, this press section comprises at least two independent nips, and this press section is realized the sealing traction of paper web between first and second nips, thereby improves behavior in service and draw difference is unlikely paper web is taken place flexible.Another object of the present invention provides a kind of press section, and wherein, first adds long nip press dewaters paper web effectively, and adds in the long nip press partly owing to the web temperature raising makes further effectively dehydration of paper web second.Another object of the present invention provides a kind of press section, wherein, in second nip, can improve the smoothness of paper web in case of necessity, because paper web generally can become coarse after adding long nip press through first.The compactness of press section of the present invention and simple structure interrelate with the purpose that a kind of low especially structure is provided, and the felt loop is not only low but also simple in this low structure.
Another object of the present invention provides a kind of press section, wherein can rely on gravity to be scavenged into the pulper that is arranged in the press section below or to damage the paper conveyer belt damaging paper effectively.
Another object of the present invention provides a kind of basic design that is applicable to that press section updates, and can make paper machine speed and/or dewatering raising when updating, and also can install to original press section position to the press section that upgrades.
Purpose for achieving the above object and narrating below the present invention is characterized in: after the paper web branchpoint, the top fabric of last nip has one than short stroke, subsequently under the guiding of the lower compression roller of nip in the end through the ring segment of a suitable wide-angle; And last nip is positioned at after the peak of the lower compression roller that constitutes described nip or nearby, and the branchpoint that paper web enters on the dry net of the first group of dry cylinder of drying section after the press section is positioned under the last nip height.
The present invention can successfully provide a kind of design of novelty for press section, thereby not only obtains fine quality paper under high speed, and the running of press section is reliable.The present invention uses at least one to add long nip press, and the length of the nip of described squeezing on the paper machine direction is generally greater than about 100mm, thereby also can guarantee abundant dehydration under high speed.The position arrangement of a regularly last nip of main novel part of the present invention, with this guarantee web transfers steadily, fully dehydration, eliminate the difference of paper web two surface roughness and paper web being delivered to reliably on the dry net of first group of drying of drying section cylinder in case of necessity.In the present invention, the bigger lower compression roller of diameter that has only a nip to be used to be preferably smooth surface, thus reduced the height of last nip top fabric loop.The present invention also relies on gravity to remove broken effectively first after adding long nip press.
When press section of the present invention being used for thin printing and writing paper, an available large pressuring roller nip is changed first and is added long nip press, wherein can use a pressure roller bigger than common pressure roller diameter that nip length is increased to Len req, in this case, this pressure roller diameter is generally elected about 1000-2000mm as.In case of necessity, also can be owing to the pressure roller diameter of above-mentioned diameter is realized this structure.
Some embodiments of the present invention shown in each figure describe the present invention in detail with reference to the accompanying drawings, but the present invention also only is strictly limited to the details of described embodiment.
Fig. 1 is the diagrammatic side view of first embodiment of the invention, wherein shows its gantry configuration;
Fig. 2 represents second embodiment of the invention, has wherein used two to add long nip press in succession, but not shown gantry configuration;
Fig. 3 represents not illustrate the third embodiment of the invention of gantry configuration, and the paper web direction of transfer of this embodiment behind the second pressure roller nip is different from first embodiment shown in Figure 1;
Fig. 4 represents not illustrate the fourth embodiment of the invention of gantry configuration, wherein has a conveyer belt to detour on the lower compression roller of the second pressure roller nip, and by means of this conveyer belt along a sealing traction, paper web is sent on the dry net of drying section;
Fig. 5 represents to be specially adapted to the embodiment of the invention than the ground paper face, and what wherein last nip was used also is to add long nip press;
Fig. 6 represents a kind of correction to press section shown in Figure 5, and wherein first nip is the large pressuring roller nip;
Fig. 7 represents a kind of correction that press section shown in Figure 4 is made, wherein replaces original first to add long nip press with the large pressuring roller nip.
Hereinafter begin the common trait of key diagram 1 earlier to press section shown in Figure 5.Paper web W 0Pass to press section from forming net 10, promptly before net slewing rollers 11 with the pull of vacuum of the region of no pressure 13a of paper carrying roll 13 paper web W 0Be sent on the press fabric 16 from forming net 10.Last press fabric 16 by deflector roll 15 and 15 ' guiding is written into first nip to paper web W with its lower surface, and this nip is obviously for adding long nip press NP 1Paper web W passes between two suction press fabrics 16 and 17 and adds long nip press NP 1Nip.Last fabric is above-mentioned paper injection fabric 16, and following fabric 17 is a water absorbing fabric 17, and it is adding long nip press NP by deflector roll 18,18 ' guiding 1After continue to carry paper web W, and go up fabric 16 in deflector roll 15 ' district or before separate with paper web W.
Add long nip press NP with first of the effective dehydration in both sides 1Be formed on a bottom than on roller 20 and the hard roller shell between the pressure roller 21.On the soft roller 20 in bottom, have a flexible soft roller shell 20 '.This soft roller 20 can be for example above-mentioned Finnish patent application 905798 of the applicant (be an European patent bulletin 0487483A1) the sort of soft roller wherein shown in Figure 10.Flexible roller shell 20 ' in squeezing sliding shoes 22 is arranged, this sliding shoes also will describe in detail in described application, produces in nip with it and compresses less.Add long nip press NP 1In rigid roller shell 21 ' the have smooth outer surface or the not perforated macaroni of last pressure roller 21.The first lengthening district NP 1Also can be used as last pressure roller 21 to soft roller, and the rigid rolls of shiny surface/macaroni is used as lower compression roller 20.If it is less to add in the long nip press squeeze pressure, then lower compression roller 20 also can be a vacuum furnace.In this case, use vacuum furnace to help helping paper web W to be close to felt 17 down.Add long nip press NP 1And other adds long nip press NP 2If (have this to add long nip press NP 2) nip length on the paper machine direction is generally greater than about 100mm, is preferably 150-300mm.Adding long nip press NP 1, NP 2In, the controlled compression pressure of neutralizing makes it obtain best squeezing effect on the paper machine direction and on the cross-sectional direction certain distribution being arranged all.Squeeze 21 inside can adorn in variation in altitude device 23, add long nip press NP thereby can make 1In compression pressure be to become certain distribution reposefully at least.As mentioned above, first adds long nip press NP 1Dehydration effectively therefore for example, is adding long nip press NP 1Before if paper web W 0Solids content K 0≈ 12-25% is then adding long nip press NP 1Described afterwards solids content K 1≈ 25-50%.
The rack construction of this press section that brief description is shown in Figure 1.The rack construction of this squeezer comprises forebay 70 and the afer bay 80 that is supported on the paper machine factory building foundation element 100.Forebay 70 comprises upright body 71a and 71b, and between upright body 71a and 71b, first adds long nip press NP 1Pressure roller 20 and 21 bearing supports support by horizontal frames spare 73a and 73b.With the intermediate arm 74 that gimbal joint 75a and 75b are housed the bearing supports of last pressure roller 21 is propped up part on horizontal frames spare 73b, add long nip press NP thereby can open first 1Afer bay 80 comprises upright body 81a, 81b, horizontal element 82 and is contained in jut 53 on the upright body 81a.The second nip N 2Lower compression roller 40 be fixedly mounted on the upright body 81b.One horizontal element 81c is arranged, and the first dry cylinder 47 is contained on the frame member 81d between upright body 81b and 81a.In mmi machine frame and afer bay 70 and 80,,, open middleware 90 and just can change fabric 16,17 and 38 by general-purpose type Yi Bian openable middleware 90 is arranged in the driving of paper machine.Can reserve the free space T that upwards freely opens between mmi machine frame and afer bay 70 and 80, in case of necessity by this freely open space T lift straight up pressure roller and other parts be replaceable they.Replacing with fabric 16 and at 38 o'clock, steering handle deflector roll 15 and 37 that can arrow V moves to position 15V and 37V inwards.
The following describes mainly by Fig. 1, Fig. 3 and press section shown in Figure 4, in this press section, first adds long nip press NP 1Second nip afterwards is minor diameter pressure roller district N 2The second pressure roller nip N 2The position add long nip press NP than first 1High slightly, described difference in height N 0(see figure 3) is generally H 0≈ 500-2000mm.In the embodiment shown in fig. 1, can make the whole height H of press section lower, the described height H on the sorting machine plane is generally H ≈ 5-12m.Thereby,, therefore can form low structure because the closed loop of last fabric 16 and 38 also can be done lowly and simplify.Nip NP 1With N 2Between horizontal range L on machine direction be generally L ≈ 5-12m.
Shown in Fig. 1,3 and 4, paper web W with vacuum delivery roll 35 or have smooth roll shell 25 ' slewing rollers 25 (see figure 3)s add long nip press NP from first 1The upper surface of following fabric 17 be delivered to the second pressure roller nip N 2The lower surface of last fabric 38,38B on.When being delivered on fabric 38, the 38B from descending fabric 17, use an as far as possible little angle a to paper web W 0Change direction, this angle initialization becomes a 0＜45 °, a preferably 030 ° of ≈.In Fig. 1 and Fig. 4, last fabric 38 is the press fabric of suction, and use a vacuum furnace to transmit this moment, and this vacuum delivery roll 35 has a region of no pressure 35a.In Fig. 3, last fabric 78B is the fluid-tight again transmission band 38B that roughly neither absorbs water, and this moment, delivery roll 25 was not a vacuum suction roll, but with the adhesiveness of transmitting band 38B outer surface paper web was sent to fabric 38B from fabric 37.Behind branchpoint, last fabric 38,38B have an oblique straight line short stroke that makes progress.The length L of the trip 0(see figure 3) is generally L 0≈ 400-2000mm.On this one stroke of fabric 38,38B, in the outside of described fabric seal closed-loop,, a steam chest 42 is housed over against the free lower surface of paper web W, this steam chest is equipped with the conduit 42a of a supply high water vapor.
In press section shown in Figure 3, last nip N2 is particularly suitable for coming press polish to treat the asymmetric roughness of platen width of cloth W opposite sides as calendering nip with it, and this is asymmetric to be to add long nip press NP first 1In cause.At this moment, the surface characteristic of transmission fabric 38B is chosen to be applicable to this press polish effect.
In Fig. 1 and Fig. 4, press in the fabric seal closed-loop 38 with steam chest 42 over against the position on a vacuum tank 43 is housed, it preferably according to the air blast principle and by the applicant with trade mark PRESS-RUN TMA kind of straight empty van on sale on market does not use this vacuum tank in the embodiment shown in fig. 3.The free outer surface heating of 42 couples of paper web W of steam chest adds thermal effect and is further strengthened by vacuum tank 43.In Fig. 4, fabric 38,38B are through rectilinear path L at Fig. 1 0The back is at minor diameter pressure roller nip N 2Before by the second nip N 2The segmental arc a1 of shiny surface lower compression roller 40.Described segmental arc is generally elected a as 140-130 ° of ≈ are preferably a 160-100 ° of ≈.Promptly form pressure roller nip N on described lower compression roller 40 and the macaroni between the pressure roller 41 2In Fig. 3, the surface 41 of last pressure roller 41 " can be a smooth surface.Cooperate pressure roller nip N 2Lower compression roller 40 shiny surface 40 ', heater 60 is housed, can be by its gap 61 with for example infrared radiation, electromagnetic induction effect and/or high-temperature vapour to pressure roller face 40 ' heating.Like this, the temperature of this pressure roller face is brought up to T 060-150 ℃ of ≈ are at segmental arc a 1Place's heat energy is added the heat effect of steam chest 42, the temperature T of paper web W from pressure roller face 40 ' pass on the paper web W 1At nip N 3The sizable raising in front.This temperature is generally T 160-110 ℃ of ≈.Because segmental arc a 1Long enough, so heat is from heated pressure roller face 40 ' pass to effectively on the paper web W.Because the temperature T of paper web W 1Improve, at nip N 2, NP 2Dehydration (Fig. 5) is just strengthened.Best nip N 2, NP 2, N 3After in lower compression roller 40 first quartiles, being positioned at the peak of lower compression roller 40.Nip N in the end 2, NP 2, N 3Afterwards, paper web W has an oblique downward stroke, and paper web W is sent on the dry net 45 of drying section subsequently.
Last nip N 2, NP 2, N 3The feature of layout also be to have only a nip, promptly last nip is used the lower compression roller 40 of major diameter D ≈ 1000-1700mm, its position is a little after the peak of described lower compression roller 40.
According to Fig. 1, through the second nip N 2After, lower compression roller 40 shiny surfaces 42 ' on by a narrow margin vacuum transfer roller 44 places through on be sent on the dry net 45 behind the free short distractor W mouth, vacuum tank 46 is adsorbed onto W by a narrow margin on this dry net 45.Paper web W on dry net 45 is sent to the position than the first dry group R 1The common position of last drying cylinder will be low first drying cylinder 47 on.Paper web turns to vacuum reservoir 50, for example the applicant's VAC to drying section subsequently TMRoller.Also illustrate among Fig. 1 and be positioned at the contact drying cylinder 48 of first on the common height and air blast vacuum tank 49, for example the applicant's UNO RUN BLOW BOXES TM
In Fig. 3, through the second pressure roller nip N 2After, paper web W is along with upper conveyor belt 38B arrives branchpoint TR through oblique downward rectilinear path under it supports, and here paper web W just passes to cylinder group R on the 51a of the region of no pressure of vacuum delivery roll 51 1The surface of dry net 45 on.In Fig. 3, first group of drying cylinder R 1Be one to turn to group, wherein, heated contact drying cylinder 48A is row down, and turns to vacuum reservoir 50A last row.
In Fig. 4, used at pressure roller nip N 2 Lower compression roller 40 on the conveyer belt 38A that advances, at the second pressure roller nip N 2Afterwards, paper web W is sent to first group of drying cylinder R at branchpoint TR place by the vacuum action of the region of no pressure 44a of vacuum delivery roll 44B after oblique downward rectilinear path on described conveyer belt 38 upper surfaces 1On the dry net 45.Behind branchpoint TR, conveyer belt 38A is guided by roller 47A.If use conveyer belt 38A, use the heater 60 of pressure roller 40 always not favourable, but can directly heat conveyer belt 38A where necessary, illustrate this point with heater 60A among Fig. 4.
Fig. 2 illustrates one embodiment of the invention, wherein uses two to add long nip press NP in succession behind the paper injection point P of paper web 1And NP 2The first nip NP 1With above-mentioned identical with described first nip of Fig. 4 with reference to Fig. 1, Fig. 2.Through first suction go up the slewing rollers 15 of fabric 16 ' after, paper web W be loaded in suction down on the fabric 17 through between two deflector rolls 18 oblique to behind the down stroke 25a place, the region of no pressure of vacuum transfer roller 25 be sent to that electric deflector roll 26 guides second on the fabric 27.In this section, the described low-angle a of the directed change of paper web W 0, on the upper surface of fabric 27 in second suction, paper web W is imported into second and is added long nip press NP 2, this adds long nip press NP 2In have one be equipped with soft roller shell 30 ' lower compression roller 30 and have shiny surface or a macaroni roller shell 31 ' rigidity on pressure roller 31.In pressure roller 30 and 31, be equipped with and the first nip NP 1In the sliding shoes 22 squeezing sliding shoes 32 and 33 identical with 23.
Embodiment illustrated in fig. 2ly be specially adapted to every square of Mick number and be generally 60-300g/m 2Ground paper.In this case, paper web W adds long nip press NP first 1After solids content K 1Be generally K1 ≈ 30-50%, and add long nip press NP second 2After be generally K 2≈ 45-55%.Behind fabric 27 on second, be loaded in second and add long nip press NP 2Suction under paper web W on the fabric 28 be sent to the 3rd pressure roller nip N at 35a place, the region of no pressure of vacuum transfer roller 35 1 Last fabric 38 on.The 3rd pressure roller nip N 3And the layout of various devices and the second pressure roller nip N shown in Figure 1 2Identical.
In Fig. 2, last pressure roller district N 3 Last fabric 38 can replace with conveyer belt 38B shown in Figure 3, this moment last nip N 3Be particularly suitable for as calendering nip, get final product balanced paper web nip NP in front with it 1And NP 2The roughness unshapeliness that causes.
Fig. 5 illustrates such an embodiment of the present invention, wherein, and the second pressure roller nip N shown in Figure 1 2Change into and add long nip press NP 2Second adds long nip press NP 2Constitute by the last pressure roller 30 that flexible soft roller shell 30 ' one nips lengthening is housed, to lower compression roller be one have smooth 31 ' rigid rolls 31, its inside is equipped with and is used for regulating medium-altitude sliding shoes 33.Adding long nip press NP 2After, paper web W advance the shiny surface 31 of depressing pressure roller 31 ' on, leave this shiny surface subsequently and be sent on the dry net 45 of first group of drying cylinder of drying section after through a free short distractor WD.
The present invention is to the second nip N 2, NP 2Or the 3rd nip N 3Layout also help to described nip have shiny surface 40 ', 31 ' lower compression roller 40,31 strike off, this kind is arranged as removing device and reserved enough spaces.Described scaler 63 shown in Figure 1, it directly leads to the pulper (not shown) of below vertically, and the damage paper that falls into described pulper is represented with mark WA at Fig. 1.
Fig. 6 and Fig. 7 illustrate an embodiment of the present invention, wherein, and the first nip NP 10Not to add long nip press NP 1, but the large pressuring roller nip.Press section shown in Figure 6 is identical with Fig. 5 in others, and press section shown in Figure 7 is identical with Fig. 4 in others.
According to Fig. 6, first pressure roller nip NP 10Have two press fabrics 16 and 17, this nip is made of last pressure roller 210 and lower compression roller 200, and pressure roller 200 and 210 all has the macaroni 201,211 that is formed by groove and/or high hole.The first pressure roller nip NP of Fig. 7 10It also is such formation.Use its diameter D 0Greater than the pressure roller 200,210 of the general diameter pressure roller nip NP that extends 10In general, use diameter D bThe pressure roller of the ≈ 1000-2000mm pressure roller nip NP that can fully extend 10Within the scope of the present invention, nip NP 10Pressure roller diameter D bNeedn't be greater than common diameter, this moment is if will add long nip press NP 10, can select the thick press fabric of this common thickness 16 and/or 17 for use.Fig. 6 and press section shown in Figure 7 are specially adapted to tin printing paper and writing tissue.With add long nip press and soft pressure roller is compared, large pressuring roller nip NP 10An advantage be low cost of manufacture.
Provide typical case, the preferred embodiment of the line pressure of each nip of press section of the present invention below, but the present invention is not limited to these embodiment.
First adds long nip press NP 1≈ 1200KN/m is preferably 1000KN/m;
Second adds long nip press (Fig. 2) NP 2≈ 1200ka/m is preferably about 1000KN/m;
Second adds long nip press (Figure 57 NP 2≈ 1200KN/m is preferably about 1000KN;
The second pressure roller district N 2≈ 200KN/m is preferably about 150KN/m;
The 3rd pressure roller is pressed N 2≈ 200KN/m is preferably about 150KN/m.
Adding long nip press NP 1, NP 2With large pressuring roller nip NP 10In, preferably use this heavy slightly usually thick slightly press felt, because their dehydrating amount is bigger, and the easier impression that on paper, produces fabric or macaroni of high squeeze force.
Add the soft roller shell 20 of the pressure roller 20,30 of long nip press ', 30 ' be preferably and have ditch, the macaroni of high hole or other groove.
According to the present invention, can form a compact especially compression unit, thereby this side says in the update of paper machine, even the water separation capability of press section improves along with the raising of the running speed of paper machine, also can be installed to three pressure rollers or the pressure roller only formed to this press section and have now on the position of press section, for example the applicant's SYM-YRESS II by the pressure roller nip TMOn the position of type squeezer.
Within the scope of the present invention, above-mentioned details can have all changes.For example heat last nip N 2, NP 2, N 3The device 60 of pressure roller 40 can be contained in this pressure roller inside, and for example, it can use the high-temperature vapor of supplying by as the pressure roller shaft of heat catalysis as drying cylinder.In addition, in case of necessity, for the different qualities of controlling paper web W distributes, can be on the surface that transversely makes pressure roller 40 40 of the axial top paper web W of pressure roller 40 ' temperature become certain and distribute.As the coating of pressure roller 40,31, can use the applicant's VALROK TMOr DYNAROK TMCoating or its suitable thing.
Total shape of press section preferably is arranged to like this, and first adds long nip press NP 1Position height and paper web W at branchpoint TR place or the height when being delivered on the dry net 45 with free travel WD roughly the same.Last nip N 2, NP 2, N 3The position be higher than described height, described height difference H 0≈ 600-2000mm.In order to utilize the space best, to remove and damage paper and transmit paper web W 1Last nip N 2, NP 2, N 3Preferably be positioned at after the peak of lower compression roller 40,31, at the most near described peak, in this case, paper web W from last nip to dry net 45 transmission substantially smooth ramp carry out to downward stroke.
Provide the claim of this patent below, in the scope of the inventive concept that described claim limits, thereby various details of the present invention can be changed and is different from above-mentioned details of exemplifying.

Claims (16)

1. nip (the NP that places before and after a kind of press section in the paper machine, this press section comprise at least two 1, NP 2, NP 10, N 2, N 3), in these nips, first nip is one to add long nip press (NP at least 1) or a large pressuring roller nip or common nip (NP 10), in this press section, last nip (N 2, NP 2, N 3) the position than last nip (NP 1, NP 2, NP 10) high (H); In this press section, if use two above nips, then last nip (N 3) before nip (NP 2) be provided with two suction press fabrics (16,17; 27,28), paper web W is delivered to last nip (N on the following fabric of described press fabric 2, NP 2, N 3) last fabric (38,38A) on, and imported into last nip (N on the lower surface of paper web W fabric (38,38A) on this 2, NP 2, N 3), it is characterized in that, after paper web (W) branchpoint, last nip (N 2, NP 2, N 3) last fabric (38,38A) have one oblique make progress than short stroke (L 0), described subsequently fabric (38, the 38A) nip (N in the end that goes up 2, NP 2, N 3) the guiding of lower compression roller (40,31) under turn over a sizable segmental arc (a 1); Last nip (N 2, NP 2, N 3) be positioned at the rear or nearby of the peak of the lower compression roller (40,31) that constitutes described nip; Paper web (W) is sent to first group of drying cylinder (R in this press section drying section afterwards 1) dry net (45) on branchpoint (TR) be positioned at last nip (N 2, NP 2, N 3) the below.
2. by the described press section of claim 1, it is characterized in that, in the end nip (N 2, NP 2, N 3) the described oblique upward stroke of last fabric (38,38B) on, near the free lower surface of paper web (W), the heater of steam chest (42) is preferably arranged, it is nip (N in the end 2, NP 2, N 3) improve the temperature (T of paper web (W) before 1).
3. by claim 1 or 2 described press sections, it is characterized in that, cooperate last nip (N 2, NP 2, N 3) lower compression roller (40,31), the heater (60) of the roller shell (40 ', 31 ') of a described pressure roller of heating (40,31) is arranged, to improve the temperature (T of described pressure roller face (40 ', 31 ') with it 0), thereby nip (N in the end 2, NP 2, N 3) before segmental arc (a 1) on, the temperature (T of paper web (W) 1) nip (N in the end 2, NP 2, N 3) be improved before.
4. by the described press section of above-mentioned arbitrary claim, it is characterized in that, in the end nip (N 2, NP 2, N 3) the closed loop of last fabric (38) in, on this on described rectilinear path of fabric, one vacuum tank (43) is arranged, with it paper web (W) is close on the surface of described upward fabric (38), and the heat of the steam chest (42) of another side is penetrated in the paper web (W).
5. by the described press section of above-mentioned arbitrary claim, it is characterized in that, at paper web (W) from last nip (NP 1, NP 2) following fabric (17,28) be delivered to last nip (N 2, NP 2, N 3) last fabric (38,38B) on the branchpoint place, this steering angle a 0＜45 °, best a 0＜30 °.
6. by the described press section of above-mentioned arbitrary claim, it is characterized in that last fabric (38,38B) is nip (N in the end 2, NP 2, N 3) before the big or small a of segmental arc 1Be chosen to a 1130 ° of-45 ≈ are preferably a 160-100 ° of ≈.
7. by the described press section of above-mentioned arbitrary claim, it is characterized in that this press section comprises two nips, wherein, first nip is for adding long nip press (NP 1), and last nip (N 2) be minor radius pressure roller nip.
8. by the described press section of arbitrary claim in the claim 1 to 6, it is characterized in that this press section comprises two nips, they all are to add long nip press (NP 1, NP 2), preferably be arranged to like this: first adds long nip press (NP 1) lower compression roller be one the soft pressure roller (20) of flexible soft roller shell (20 ') to be housed, and the second nip (NP 2) last pressure roller also be a soft pressure roller (30).
9. by the described press section of arbitrary claim in the claim 1 to 6, it is characterized in that this press section comprises three nips in succession, preferably arrange like this, two nips in front be have two press fabrics add long nip press (NP 1NP 2), last nip is minor diameter pressure roller nip (N 3).
10. by the described press section of arbitrary claim in the claim 1 to 6, it is particularly useful as makes tin printing paper and writing tissue, it is characterized in that first nip in this press section is a pressure roller nip (NP 10), be preferably large pressuring roller nip (NP 10), two suction press fabrics (16,17) pass this nip.
11. by the described press section of claim 10, it is characterized in that, use the pressure roller diameter bigger to realize the first pressure roller nip (NP than pressure roller general diameter 10) lengthening, described diameter is preferably elected D as 0≈ 1000-2000mm; And/or use the thicker suction press fabric of this common press fabric (16,17) to realize the lengthening of this pressure roller nip.
12., it is characterized in that paper web (W) is from last nip (N by the described press section of above-mentioned arbitrary claim 2, NP 2, N 3) shiny surface lower compression roller (40,31) be passed to first group of drying cylinder (R of drying section through a free short stroke (WD) 1) dry net (48) on.
13., it is characterized in that last nip (N by the described press section of arbitrary claim in the claim 1 to 11 2) last fabric be the waterproof conveyer belt of cardinal principle (38B) that do not absorb water, in the end nip N 2, NP 2, N 3) after, paper web (W) is uploaded to branchpoint (TR) at this conveyer belt lower surface, is preferably at this some place paper web (W) on the region of no pressure (37a) of vacuum transfer roller (35) to be passed on the dry valve (45) of first group of drying cylinder of drying section.
14. by the described press section of arbitrary claim in the claim 1 to 11, it is characterized in that, substantially the shiny surface conveyer belt (38A) that does not the absorb water nip (N in the end that detours 2, NP 2, N 3) lower compression roller (40) on, paper web (W) preferably is sent on the dry net (45) of first group of drying cylinder of drying section from the region of no pressure (44a) of vacuum transfer roller (44B) with this conveyer belt.
15., it is characterized in that first adds long nip press (NP by the described press section of above-mentioned arbitrary claim 1) and the branchpoint (TR) of paper web (W) on the dry net (45) of press section back be located substantially on the same horizontal plane, by contrast, the last nip (N in the press section 2NP 2N 3) be positioned at than on the high position of this horizontal plane height difference H therebetween 0≈ 500-2000mm.
16., it is characterized in that last nip (N by the described press section of above-mentioned arbitrary claim 2, NP 2, N 3) reposefully oblique upwards the length L 0 ≈ 400-2000mm of rectilinear path, the preferably L of last fabric (38,38B) after paper web (W) branchpoint 0≈ 700-1400mm, and/or press section direction overall height H ≈ 5-12m, preferably H ≈ 6-9m on the paper machine plane.
CN95107629A 1995-04-24 1995-06-29 Press section of paper machine which press section is provided with two separate press nips Expired - Fee Related CN1041006C (en)

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FI951934A FI114227B (en) 1995-04-24 1995-04-24 Paper machine with press section and dryer section
FI951934 1995-04-24

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US5762761A (en) 1998-06-09
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US5650049A (en) 1997-07-22
CN1041006C (en) 1998-12-02
KR960037958A (en) 1996-11-19
CA2152201C (en) 1999-09-07
DE69524206T2 (en) 2002-05-23
KR100228924B1 (en) 1999-11-01
EP0740017A1 (en) 1996-10-30
DE69524206D1 (en) 2002-01-10
FI114227B (en) 2004-09-15
FI951934A0 (en) 1995-04-24
JP3307524B2 (en) 2002-07-24
CA2152201A1 (en) 1996-10-25
FI951934A (en) 1996-10-25
EP0740017B1 (en) 2001-11-28

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